Lewiston, MN Radon Levels

Q: What EPA Radon Zone is Lewiston in?

Lewiston is in Winona County, EPA Zone 1.

Q: How much does radon mitigation cost in Lewiston?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Lewiston radon levels and find certified testing and mitigation professionals to keep your home safe

Lewiston, MN Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Winona County, MN

Zip Code 55952

Positioned along the Mississippi River in Winona County, Lewiston sits in southeastern Minnesota where limestone bluffs and river valley geology can influence radon levels. Testing data for zip code 55952 remains limited, emphasizing the importance of individual home radon testing in this scenic river community. Minnesota's karst limestone formations and the area's mix of foundation types create conditions where radon monitoring is particularly important for homeowner safety.

8.50

pCi/L area average

Above EPA Action Level

Winona County average: 8.50 pCi/L, based on 2 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Lewiston itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Lewiston, MN Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

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Radon Readings Near Lewiston, MN

No homeowner tests have been submitted for Lewiston yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Winona	9.2 mi	10.00 pCi/L	1
Minnesota City	10.0 mi	7.00 pCi/L	1
La Crescent	28.6 mi	7.50 pCi/L	2
Le Roy	44.0 mi	8.00 pCi/L	1

Winona County Radon Profile

The bedrock and soils beneath Winona County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 2 cities in Winona County average 8.50 pCi/L across 2 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Winona County.

Radon FAQ for Lewiston, MN

What EPA Radon Zone is Lewiston in?

Lewiston and the 55952 zip code are in Winona County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

Why are radon readings shown from areas near Lewiston?

No homeowner radon tests have been submitted for Lewiston yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Winona County average—are the best available indicator of local conditions until Lewiston homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Lewiston?

Radon mitigation in Lewiston typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Lewiston?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.